* We use secret_service_get() to lookup the default
SecretService in these cases.
* Use this functionality in the secret_password_xxx()
functions to greatly simplify them.
* And flags to prevent loading of items when creating a
SecretCollection object
* Rename secret_service_ensure_collections() to
secret_service_load_collections()
* This allows callers to use a custom SecretService derived
type with the rest of libsecret
* The default way to get a SecretService is via secret_service_get()
which remains simple without the GType parameter
* Cleanup secure memory allocator for valgrind.
* Bring valgrind headers in.
* Add lots of suppressions for glib, gdbus, gcrypt
* Fix up a bunch of bugs where things weren't getting freed
* Add new 'make check-memory' target
